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Prediction of hydrodynamic properties of mixed-particle systems and theoretical analysis of loop pressure profile in a CFB unit / Mitali Das in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4953–4961 Titre : Prediction of hydrodynamic properties of mixed-particle systems and theoretical analysis of loop pressure profile in a CFB unit Type de document : texte imprimé Auteurs : Mitali Das, Auteur ; B. C. Meikap, Auteur ; R. K. Saha, Auteur Année de publication : 2008 Article en page(s) : p. 4953–4961 Note générale : Bibliogr. p. 4961 Langues : Anglais (eng) Mots-clés : Mixed  particle  systems;  Circulating  fluidized  bed;  Hydrodynamic  properties Résumé : The hydrodynamic behaviors of mixed system of particles were investigated in a circulating fluidized bed (CFB) unit consisting of fast column (riser) with an inner diameter of 0.1016 m and a height of 5.62 m. Particle mixtures containing a Geldart group-A-like fluid catalytic cracking (FCC) catalyst with group-B-like sand and iron ore with coal were used to study the hydrodynamic features including static pressure, voidage, and loop pressure profile. The mixed system consisting of FCC catalyst and sand contained 20, 50, and 80 mass % sand, and the coal−iron ore mixture contained 80 mass % coal. The superficial air velocity ranged between 2.01 and 4.681 m/s, and the corresponding mass fluxes were 12.5−50 kg/(m2 s). A comparison of the available experimental values for static pressure profiles at different operating conditions for mixed-particle systems shows good agreement with those predicted from the single-particle systems. Using experimental data on the loop pressure balance, a simplified theoretical analysis was performed to predict the pressure profile in the CFB loop. The deviations between the two sets of values are within reasonable limits of accuracy. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800477w [article] Prediction of hydrodynamic properties of mixed-particle systems and theoretical analysis of loop pressure profile in a CFB unit [texte imprimé] / Mitali Das, Auteur ; B. C. Meikap, Auteur ; R. K. Saha, Auteur . - 2008 . - p. 4953–4961. Bibliogr. p. 4961 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4953–4961 Mots-clés : Mixed  particle  systems;  Circulating  fluidized  bed;  Hydrodynamic  properties Résumé : The hydrodynamic behaviors of mixed system of particles were investigated in a circulating fluidized bed (CFB) unit consisting of fast column (riser) with an inner diameter of 0.1016 m and a height of 5.62 m. Particle mixtures containing a Geldart group-A-like fluid catalytic cracking (FCC) catalyst with group-B-like sand and iron ore with coal were used to study the hydrodynamic features including static pressure, voidage, and loop pressure profile. The mixed system consisting of FCC catalyst and sand contained 20, 50, and 80 mass % sand, and the coal−iron ore mixture contained 80 mass % coal. The superficial air velocity ranged between 2.01 and 4.681 m/s, and the corresponding mass fluxes were 12.5−50 kg/(m2 s). A comparison of the available experimental values for static pressure profiles at different operating conditions for mixed-particle systems shows good agreement with those predicted from the single-particle systems. Using experimental data on the loop pressure balance, a simplified theoretical analysis was performed to predict the pressure profile in the CFB loop. The deviations between the two sets of values are within reasonable limits of accuracy. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800477w

Voidage and pressure profile characteristics of sand-iron ore−coal−FCC single-particle systems in the riser of a pilot plant circulating fluidized bed / M. Das in Industrial & engineering chemistry research, Vol. 47 n°11 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 4018–4024 Titre : Voidage and pressure profile characteristics of sand-iron ore−coal−FCC single-particle systems in the riser of a pilot plant circulating fluidized bed Type de document : texte imprimé Auteurs : M. Das, Auteur ; B. C. Meikap, Auteur ; R. K. Saha, Auteur Année de publication : 2008 Article en page(s) : p. 4018–4024 Note générale : Bibliogr. p. 4024 Langues : Anglais (eng) Mots-clés : Single-particle  systems;  Circulating  fluidized  bed;  Iron  ore;  Coal Résumé : Hydrodynamic behaviors of single system of particles were investigated in a circulating fluidized bed (CFB) unit. Particles belonging to Geldart groups A and B like sand of various sizes (80, 300, 417, 522, 599, and 622 μm), FCC catalyst (120 μm), iron ore (166 and 140 μm), and coal (335 and 168 μm) were used to study the hydrodynamic characteristics. Superficial air velocity used in the present study ranged between 2.01 and 4.681 m/s and corresponding mass fluxes were 12.5−50 kg/(m2 s). A CFB needs the creation of some special hydrodynamic conditions, namely a certain combination of superficial gas velocity, solids circulation rate, particle diameter, density of particle, etc. which can give rise to a state wherein the solid particles are subjected to an upward velocity greater than the terminal or free fall velocity of the majority of the individual particles. The hydrodynamics of the bed was investigated in depth and theoretical analysis is presented to support the findings. Based on gas−solid momentum balance in the riser, a distinction between apparent and real voidage has been made. The effects of acceleration and friction on the real voidage have been estimated. Results indicated a 0.995 voidage for higher superficial gas velocity of 4.681 m/s. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800282f [article] Voidage and pressure profile characteristics of sand-iron ore−coal−FCC single-particle systems in the riser of a pilot plant circulating fluidized bed [texte imprimé] / M. Das, Auteur ; B. C. Meikap, Auteur ; R. K. Saha, Auteur . - 2008 . - p. 4018–4024. Bibliogr. p. 4024 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 4018–4024 Mots-clés : Single-particle  systems;  Circulating  fluidized  bed;  Iron  ore;  Coal Résumé : Hydrodynamic behaviors of single system of particles were investigated in a circulating fluidized bed (CFB) unit. Particles belonging to Geldart groups A and B like sand of various sizes (80, 300, 417, 522, 599, and 622 μm), FCC catalyst (120 μm), iron ore (166 and 140 μm), and coal (335 and 168 μm) were used to study the hydrodynamic characteristics. Superficial air velocity used in the present study ranged between 2.01 and 4.681 m/s and corresponding mass fluxes were 12.5−50 kg/(m2 s). A CFB needs the creation of some special hydrodynamic conditions, namely a certain combination of superficial gas velocity, solids circulation rate, particle diameter, density of particle, etc. which can give rise to a state wherein the solid particles are subjected to an upward velocity greater than the terminal or free fall velocity of the majority of the individual particles. The hydrodynamics of the bed was investigated in depth and theoretical analysis is presented to support the findings. Based on gas−solid momentum balance in the riser, a distinction between apparent and real voidage has been made. The effects of acceleration and friction on the real voidage have been estimated. Results indicated a 0.995 voidage for higher superficial gas velocity of 4.681 m/s. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800282f